US 12,130,531 B2
Composite electrophoretic particles and variable transmission films containing the same
Jin-Gyu Park, Lexington, MA (US); Richard J. Paolini, Jr., Framingham, MA (US); Peter Carsten Bailey Widger, Nashua, NH (US); Jillian Smith, Dorchester, MA (US); Jay William Anseth, Canton, MA (US); Craig A. Herb, Medford, MA (US); George G. Harris, Woburn, MA (US); and Mark Benjamin Romanowsky, Cambridge, MA (US)
Assigned to E Ink Corporation, Billerica, MA (US)
Filed by E INK CORPORATION, Billerica, MA (US)
Filed on Jan. 3, 2023, as Appl. No. 18/092,747.
Application 18/092,747 is a continuation of application No. 16/776,042, filed on Jan. 29, 2020, granted, now 11,567,388.
Claims priority of provisional application 62/809,978, filed on Feb. 25, 2019.
Prior Publication US 2023/0148203 A1, May 11, 2023
Int. Cl. G02F 1/167 (2019.01); C08K 3/04 (2006.01); C08L 33/12 (2006.01); G02F 1/16757 (2019.01); G02F 1/1676 (2019.01); G02F 1/1681 (2019.01); G02F 1/1675 (2019.01)
CPC G02F 1/167 (2013.01) [C08K 3/04 (2013.01); C08L 33/12 (2013.01); G02F 1/16757 (2019.01); G02F 1/1676 (2019.01); G02F 1/1681 (2019.01); C08K 2201/003 (2013.01); G02F 2001/1678 (2013.01); G02F 2202/022 (2013.01); G02F 2203/01 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An electrophoretic dispersion, comprising:
a plurality of charged composite particles, each charged composite particle including:
pigment particles comprising manganese ferrite black spinel, copper chromite black spinel, or carbon black, and having a diameter of 0.01 to 0.2 μm and
a polymeric mixture of polyethylenimine and a styrene copolymer; and
a suspending fluid.